Sand-blast file-sharpening apparatus



(No Model.)

B. N., S. N. & C. N. TRUMP & O. FREDERICK.

SAND BLAST FILE SHARPENING APPARATUS.

No. 258,506. Patented May 23, 1882.

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Warren STATES PATENT OFFICE.

EDNVARD N. TRUMP, SAMUEL N. TRUMP, CHARLES N. TRUMP, AND CHRISTIAN FREDERICK, OF WILMINGTON, DELAWVARE.

SAND-BLAST Fl LE-SHARPENING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 258,506, dated May 23, 1882.

Application filed March3, 1882. tNomodel.)

To all whom it may concern:

Be it known that we, EDWARD N. TRUMP, SAMUEL N. TRUMP, CHARLES N. TRUMP, and CHRISTIAN FREDERICK, citizens of the United States, residing at Wilmington, in the county of New Castle and State of Delaware, have invented certain new and usefullmproveinents in Sand-Blast File-Sharpening Apparatus, of which the following is a specification, reference being had therein to the accompanying drawings.

Apparatus for sharpening files by the sandblast process consists essentially of a steampipe to which are attached two nozzles or guns,

1 a boxt'or holding sand and water,anda sliding holder for introducing the file to the blast. To these may be added the steam-box for receiving the blast, collecting the sand and water, and returningthem tothe sand-boxt'or further use.

The apparatus will be more fully described by reference to the accompanying drawings, where Figure 1 shows a side elevation, partly in section; Fig. 2, a front elevation, and Fig.

2 3 a view of the stops. Figs. 4 and 5 are enlarged detached views of'the pivoted valveplate K.

Like parts in all the figures are indicated by the same letters.

0 The steam-pipe S is connected with a suitableboiler. To it are attached two brass guns, A A, with iron nozzles inserted, lying in the same vertical plane, their'central lines converging, so that theblast through them meets at a point 5 from two to four inches distant. Below the lower gun the steam-space in the pipe is cut off, and the extension, provided on its lower end with a shoe, becomes one of the legs to support and steady the apparatus.

40 Glamped to the stand-pipe just below the guns is the sand-box T. Double tubes enter this box at K, and are connected by flexible pipes with the guns A A.

A valve, F, between the guns permits the 4 5 lower one to be cutoff at pleasure.

The steam-boxU receives the blast from the guns, and is supported by suitable legs and a brace connecting it with the steam-pipe. This box, heretofore of wood, we make of iron. The

upper section farthest from the guns is enlarged, so as to check the rapidity of the current of steam and air passing through it and allow the sand and water to fall more readily. It is provided with a perforated board, laid in the V of lower section, and deflecting-boards O and N, and with uptake W, to carry off waste steam. The back end is closed by a board, I, which is removable, to give access to the interior. The cast-iron plate on front end is provided with sheet-iron pipe, surrounding 6o thejets from the guns and extending into the box about-four inches to prevent splash.

The mechanism for holding the file and introducing it to the blast is shown at l) E G. D is a bracketclamped to the steam-pipe. It has a round rod,x, approximately parallel with the vertical plane of the guns, upon which moves the traveler E, carrying the hanging arm and file-holder (J. The traveler-rod as being round and the rollers grooved, a lateral or swinging motion of the traveler can be had, as shown in Fig. 2, so as to better bring all parts of a file under the action of the blast. This lateral movement may be regulated by the adjustable stop, (shown more fully in Fig. 3, where a is a horizontallymovable lever, pivoted to the bracket 1) and carrying the rollers c a, between which lies the rail d.) When the lever a is in the position shown in the drawings-i. 0., at

right angles to the line of the rail d-the hang- 8o in g arm is capable of considerable lateral motion. By turning the arm a on its pivotin a horizontal plane the rollers c c are brought nearer and nearer to the rail d, thus limiting and regulating the lateral movement of the hanging arm to any desired degree. A gravity-catch, f, looking into suitable notches in the are of the bracket 0, confines the levera at any point. Other devices working upon a bar parallel to the traveler-rod can be used, and we do not 0 confine ourselves to this particular form of stop.

The file-holder consists of a supporting-piece, to which two jaws, g g, are pivoted. The jaws are closed by a cam, h, a coiled spring holding 9 5 the ends in contact with the surface of the cam. A spindle, d, between the jaws is thrust forward by a spiral spring encircling it, and the end of the spindle is recessed to receive the end of the file-tang when the file is in place, roe

the object being to hold the file firmly while subject to the fierce blast from the guns.

The sand-pipe head K, with double or single tubes entering the sand-box, is connected with the guns A A by flexible pipes, and provided with pivoted plate'coverin g openin gs,by means of which air may be admitted to or excluded from the flexible pipes, as desired.

A quick-opening valve admits steam to the machine.

The operation of this device is as follows: The box T is partially filled with sand and water, a file is placed in the holder 0, the valve Bis opened, and the steam rushing through the guns A A draws by induction the wet sand from the box T and projects it with great force into the steam-box U, where, passing through the perforated bottom board, V, itfiows back into the sand-box through the protected channel-way in the angle of the box. The operator, taking hold of the supportingarln of the file-holding device, traverses the tile eld in the jaws through the jet of gritty liquid projected from the guns, previously set at equal angles to the horizontal plane in which the tile travels. The lateral or swinging movement, in combination with the slidingmovement, allows all parts of a file to be exposed to the action of the blast; or the stops may be so set as to confine the file to a straight line, of espe eial advantagein sharpening the edges. When in the judgment of the operator the file has been sufficiently treated the air-valve K is opened, cutting off the flow of sand and water to the guns. The dry steam rushing from nozzles removes the dirt and moisture from the surface of the file, which can then be tested, and if not sufficiently sharpened can again be exposed to the blast.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is i 1. In an apparatus for sharpening files by sand-blast, the combination of one or more guns with an overhead train or carriage moving upon a round bar attached to a suitable support and carrying the fileholder, substantially as described.

2. In a sand-blastfile sharpening apparatus, an overhead train or carriage with grooved rollers moving upon a round bar, thus permitting a lateral movement, and provided with an adjustable stop forlimitingand regulating said lateral movement, substantially as described.

3. In a sand-blast file-sharpening apparatus, a file-holder consisting of supporting-piece, a pairofjaws closed by a cam, and provided with a central pin free to move in line with the file and recessed at end to receive the tang ot' the tile, substantially as shown and described.

4. In a sand-blast file-sharpening apparatus, the combination of one or more guns with an iron boxor case, having its upper section farthest from the guns considerably enlarged and furnished with deflecting-boards for 001- lecting sand and water and uptake for waste steam, and with month-piece extending into the box in the form of a pipe surrounding the jets or blast, substantially as described.

5. In a sand-blast file-sharpening apparatus, a headpiece for single or double sand-tubes, provided with a pivoted plate air-valve, whereby the sand and water may be readily cut oti' and the file cleaned by the dry steam, substantially as described.

In testimony whereof we aiiix our signatures in presence of two witnesses.

ED \VA RD N. TRUMP. SAML. N. TRUMP. CHARLES N. TRUMP. CHRISTIAN FREDERICK. Witnesses:

HENRY J. Cnrrrnn, Gno. R. l-Iorrncnnn. 

